Python, Determine if a string should be converted into Int or Float

def isfloat(x):
    try:
        a = float(x)
    except (TypeError, ValueError):
        return False
    else:
        return True

def isint(x):
    try:
        a = float(x)
        b = int(a)
    except (TypeError, ValueError):
        return False
    else:
        return a == b

Python float objects have an is_integer method:

from ast import literal_eval
def parses_to_integer(s):
    val = literal_eval(s)
    return isinstance(val, int) or (isinstance(val, float) and val.is_integer())